Clustering Team has published an post on their blog where they strongly recommends to apply hotfix KB2531907 when you are running SP1 and failover clustering which fixes validate “issues” during the tests in the storage section.

PLEASE NOTE: This validation “issue” is (only) reported when following conditions does apply:

You configure a failover cluster that has three or more nodes that are running Windows Server 2008 R2 Service Pack 1 (SP1).

You have cluster disks that are configured in groups other than the Available Storage group or that are used for Cluster Shared Volumes (CSV).

These disks are online when you run the Validate SCSI Device Vital Product Data (VPD) test or the List Potential Cluster Disks storage validation test.

This “issue” causes the validation tests to run also the validate storage tests (Online/Offline, Failover, PR…) against disks which are NOT in the “Available Storage Group” and “Online”! Normally those disks are excluded from validation tests and only disks in the “Available Storage Group” will be used for validation tests in storage section! More information’s around validate storage tests can be found here:

Therefore it is strongly recommended to apply this hotfix after you had installed SP1 and before you run validation tests – which are required due to Microsoft Support Policy – due to the system change for supportability reasons.